Web registering mechanism



Feb. 10, 1942. H. KOTT WEB REGISTERING MECHANISM Filed Sept. 6, 1939 4 Sheets-Sheet 1 WW M N m w WM m mm m .mH Wm Feb. 10, 1942. H, o

WEB REGISTERING MECHANISM Filed Sept. 6; 1939 4 Sheets-Sheet 2 HERA/ANN hOTT BY WHi- INVENTOR ATTORNEYS Feb; 10, 1942. KQTT H WEB REGISTERING MECHANISM 4 Sheets-Sheet 3 II HIIIIIIIIIHIIIH Illlllllllllllllfll Filed Sept. 6, 1939 I WM 5, mi a N WNMBR Q N w m H Feb. 10, 1942. H; Ko'r'r was REGISTERING MEcHAuIsM Filed Sep t. e, 1939 4 sneeis-sheet 4 "8Q INVENTOR; k

R MM m A A Q M Y H B Patented Feb. 10, 1942 2,272,376 WEB REGISTERING MECHANISM Hermann Kott, East Orange, N. J., assignor, by

mesne assignments, to Speedry Gravure Corporation, Hoboken, N. J., a corporation of New York Application September 6, 1939, Serial No. 293,527

20 Claims.

The present invention relates to web register mechanisms for printing presses and embodies, more particularly, an improved registration mechanism by means of which proper control of the web may be facilitated where a sequence of operations are to be performed upon the web. More particularly, the invention is concerned with mechanisms for indicating or controlling the movement of the web with respect to two or more printing cylinders so that effective registration ofthe web with each successive printing cylinder may be accomplished.

In the web printing art, where two or more impressions are to be applied-t a continuous web of paper or the like, and particularly where the impressions are to be properly related to form a common image, such, for example, as in multicolor printing, it is extremely important that all of the impressions forming the image be accurately applied to the web so that each will be in register. For example, where a multicolor image is to be formed by superimposing one color upon another, if the colors are not exactly in register, the edges of regions in which the various tones or colors occur will be fringed or haloedby reason of the fact that the colors are incorrectly combined at these edges. In multicolor printing, therefore, it becomes particularly important to efiect' accurate registration of the various component colors and numerous at- .tempts have been made to solve this problem.

I have found that the most effective way 'of accomplishing this result, particularly where the webtravel is at speeds of 500 to 1000 feet per minute or even more, is to determine and conrate indication or control of the condition of registration may be had under all conditions of operation, particularly where the press operating speeds are high. It is to be recalled that, in modern high speed printing operations, the indicating or controlling mechanism must be fully responsive to changes in frequency of occurrence of a printed impression on a web at any pariii indicating mechanism by means of which accuicular stage in the printing operation, where the web is traveling at speeds of, say, 1000 feet a minute. The frequency of such occurrence at each printing unit may thus be five per second and, in the device shown and described in my co-pending application above referred to, the mechanism utilizes spots that are printed on the web by the printing cylinders that print the respective colors. Photoelectric cells are utilized to pick up these spots (being responsive to changes in light intensity caused by such spots) and the resulting change in the photoelectric cell circuit is used in timed relation with the rotation of the respective cylinders to indicate whether the spot occurrence at the respective cylinder is in proper timed relation to the cylinders, so that the successive printings may be properly registered with the other impressions.

The first object of the invention, as stated above, therefore, contemplates the provision of an improved electric circuit which is fully responsive to the high frequencies of spot occurrence on the web under all conditions of operation and, in the embodiment of the invention shown and described herein, the object isachieved by utilizing the cathode ray tube utilized in the mechanism described in my aforesaid copending application with improved control mechanism and circuits so that the cathode ray beam may be modulated by impulses resulting from improper conditions of web registration.

A further object of the invention is to provide an improved mechanism of the above character whereby carrier frequencies are produced that, under improper conditions of registration,

are modulated to cause a desired indicating or tem, the individual light beams of whichare out of phase, by means of which the aforesaid double beam system may be utilized with the photoelectric cell toproduce carrier fre-- quencies that are modulated by the spot occurrence on the web, so that if out of register, cur-- rent impulses supplied to an amplifying circuit may give a desired indication.

Yet another object of the invention is to provide a mechanism, utilizing the above double beam system, by means of which the occurence of the spot on the web will always receive the light beam, thus avoiding the occurrence of the spot during the interval of time when the light beam is interrupted.

A further object of the invention resides in the provision of an improved method and apparatus by means of which external disturbances that are frequently occasioned on portions of the web may be prevented from producing false indications of lack of registry, when, actually, proper registration exists at each of the printing units. This object is achieved by utilizing one of the colors or printed impressions as a key to counteract the effect of the impulses or modulations impressed upon the cathode ray tube by the spot occurrence of other colors 'as long as the spot occurrencesare in register, but, when any of the spot occurrences is out of register, the key color or spot will fail to counteract its modulation of the cathode ray beam.

A further object of the invention is to provide an improved control element by means of which the rotation of the printing cylinder may be effectively synchronized with the modulations of the cathode ray beams occasioned by the photoelectric cells of the respective colors. More particularly, this object is achieved by an improved time segment mechanism actuated in synchronism with the drive for the printing cylinder and is so constructed that a dead segment is provided over which a contact timing arm moves, the segment being of such formation that at least one modulating cycle will always be present innism by means of which the control switch may be set effectively in the proper zero position.

A further object of the invention is to provide an improved mechanism, in combination with the photoelectric light beam control mechanism, by means of which the light beam control mechanism may be effectively adjusted during operation.

Yet another object of the invention is to provide an improved web adjusting mechanism that is automatically responsive to conditions of lack of registry of the web to move the web immediately into proper register so that, within permissible tolerances, the web will always be in proper registration.

Further objects of the invention will be apparent as it is described in greater detail in connection with the accompanying drawings, wherein:

Figure l is a diagrammatic illustration of the electrical circuits and control mechanism, in which the present invention is embodied;

Figure 2 is a view in vertical section, taken on the section line 2-2 of Figure 3 and looking in the direction of the arrows, illustrating alight beam control mechanism constructed in accordance with the present invention;

Figure 3 is a view of the device in Figure 2 taken on the section line 3-3 and looking in the direction of the arrows;

Figure 4 is a view in section taken on the broken section line 4-4 of Figure 3, and looking in the direction of the arrows;

'Figure 5 is a view in horizontal section, taken on line 5--5 of Figure 3, and looking in the direction of the arrows; Figure 6 is a view in front elevation with the switch cover removed showing a time switch mechanism constructed in accordance with the present invention;

Figure '7 is a view in section, taken on line l--'! of Figure 6, and looking in thedirection of the arrows;

Figure 8- is a schematic illustration of an automatic web tension controlling mechanism con structed in accordance with the present invention;

Figure 9 is a schematic illustration of a modified means for utilizing a key color negativing the cheat on the cathode ray of impulses due to proper register.

Figure 10 is a further modification of the circuits shown in Figure 9;

Figure 11 is a schematic illustration of the advantage of utilizing two frequencies during the time of spot occurrence under the path of the light beam; and

Figure 12 is a schematic illustration of the way in which the carrier frequencies are modulated by the spot occurrence during proper registry.

Referring particularly to Figure 1, the electrical circuits of the indicating and control mechanism of the present invention will be described. In order, however, to appreciate, in a general way, the mechanism in connection with which the present invention may be utilized, it is to be noted that one printing unit of a multiunit printing press is illustrated schematically in Figure 1 as including a printing cylinder I00 having a drive shaft Illl and an impression roller I112. The paper or other web I03 is received from a previous printing unit or units and is carried along over suitable guide rollers I04 and tension adjusting rollers I05. Each printing cylinder, in each rotation thereof, applies a spot I06 to the web in separate and distinct transversely disposed paths, and a suitable spot responsive mechanism is provided for each path so that determination of the condition of register of each of the cylinders may be accomplished. The spotresponsive mechanism will be described hereinafter, audit need only be added that the several printing cylinders and other driven mechanism of the press is driven from a drive shaft I01 through suitable gears I08, an electric motor I09 being furnished to drive the drive shaft.

-A transformer II is shown as providing a source of power from three secondary coils I2, I3 and I4. These coils supply power to tube circuits in a manner now to be described.

The secondarycoil I2 is connected to a wire I5 and to a wire I6 connected to the filament I! of a two-element tube I8. The filament circuit is completed by a wire I9 which is connected to an auxiliary secondary winding I2 in a known manner.

The plate 20 of the tube I8 is connected, by means of a wire 2|, to a condenser 22 that is connected to the wire I5 by 'ineans of a connecting wire 23, and the wire I5 is grounded at 24.

In efiecting accurate indication and control of the web registration, a cathode ray beam is utilized, the beambeing provided by a cathode ray tube I54 having a cathode 26, a control e1ecto the mid-point cr trode 21, a focusing anode 28, an accelerating anode 29, beam trav'el plates 55 and 25', and beam deflecting plates and 3|. This cathode ray tube is of standard form .and need not be further described herein. J

Current is supplied to the cathode filament by means of a battery or other source of power 52 and power circuit 33. The cathode is connected, by means of a wire 34, to a resistance 35 at the point 36. Resistance 35 is connected to the wire I5 by means of a connecting wire 31 and the cathode ray tube is thus supplied by power from the power source II. The control electrode 21 is connected to the resistance 25 through a wire 38 and contact member 35, the contact member 39 being connected to the resistance 55 at a point more negative than the point 25, also in accordance with known practice. The focusing anode 28 is connected to the resistance by a wire 40 and contact member 4|, the engagement of the contact member 4I with the resistance 25 being at a point more positive than the point 38. The accelerating anode 29 is connected to the wire I5 by means of a wire 42. The foregoing cathode ray connections and circuits form no part of the present invention.

In order to cause the cathode ray beam to travel periodically back and forth across the fluorescent screen, the plates 32 and 20' are connected in a circuit including a wire 42 which receives power irom a time switch indicated generally at 44 in a manner now to be described. The circuit of plates 30 and 25' is completed by a ground connection 45. 4

The timeswitch mechanism is illustrated in Figures 6 and 7 and consists of an insulating disc 46 carried by a sleeve 41. The disc is provided with a series of spaced contacts between which resistance coils are connected to form, in effect, continuous coils 45 and 50 (Figure 1). Adjacent ends of coils 49 and 54 are connected to a central segment 5 I which is grounded at 52 and a contact arm 52 is mounted upon a shaft 54 and driven by gearing 55 which in turn is driven from the shaft I51 that drives the printing cylinders.

As will be seen in- Figure 1, the arm 53 is connected to the wire 42. This may be accomplished by means of a contact ring 55 carried upon an insulating plate 51 mounted upon a cover plate 58. The arm 53 may have contacts 55 and for engaging the contacts 42 and ring 56, respectively, the contacts being mounted suitably so that there is no thrust on the end of the arm 53.

Adjustment of the zero position of the plate 46 may be effected by means of an electric motor 6|, gear reduction 52, drive shaft 52, and worm 64 engaging a worm wheel 55 on sleeve 41.

The coils 49 .and 50 of the time switch mechanism are supplied with power from the transformer secondary coil I3 by means of a power circuit now to be described. A rectifier 55 has its plates connected to the secondary I! by means of wire 61, the filament 55 is energizedby an auxiliary secondary coil I3 and the mid-ter minal 59 is connected to wire II which is con-. nected to the one end of resistance coil 50' through a choke 'II and variable resistance I2.

13 are connected across the choke I wire 14 which is connected Condensers H and the negative the secondary coil I5 by means of contact I5. A voltage regulator I5 and condenser 11 are connected across the wires tree end or the resistance coil 49.

The foregoing connections thus complete the powercircuit for the time switch mechanism and,- asthe contact arm 55 rotates, the power in the wire 42 varies from a positive to a negative value periodically. This causes the polarities of the plates 20 and 30' to be reversed to repel and attract, alternately, the cathode ray beam and cause it to travel in the desired fashion.

In order that the cathode ray beam may be modulated by the synchronism of the frequency of spot occurrence with the corresponding point on the respective printing cylinders, the-spot responsive mechanism will now be described.

Positioned properly with respect to so that it may be aifected by the variations of light intensity due to the existence of the spot, is an optical system illustrated in Figures 2, 3, 4 and 5, as well as schematically in Figure 1. This system includes a source oblight IIO with a lens system III by means of which alight beam is focused directly from the source of light IIII onto the web I03 in the path of travel of the spot I05. If the spot is in the position illustrated in Figures 2 and 4, it will not reflect any light back against the mirrored surfaces H2 and II: to be reflected upon the photoelectric cell I I4. If, however, the spot I05 is not at the point indicated, the web I will reflect the light in I2 and I4 and the wire I4 is connected to the the webthe manner just described, and cause a variation in the energization of the photoelectric cell II4. A second optical system H5 is also provided to direct a second light beam directly upon the photoelectric cell II4, as illustrated In Figure 2.

The action of this light beam H5 is controlled by means ofa prism I I5 carried in a sleeve Ill having an aperture 2 through which the light beam passes in its travel to the photoelectric cell, as indicated by the arrow in Figure 2. The sleeve H1 is provided with a gear II! with which a pinion I20 engages, the pinion being carried upon a shaft |2I that may be driven by a small electric motor I22 for the purpose of adjusting the direction of the beam H5, so that it may subject the photoelectric cell II4 to the desired A light intensitm is reduced, producing a wave The beams III and H5 are interrupted by means of a disc I22 driven by a synchronous motor I24 and provided with apertures I25. The spacing of the apertures and of the respective light beams III and H5 is such that, when an aperture is in register with one light beam to permit it to travel on its desired course, the disc is in register with the other light beam to obstruct. it. As the aperture moves out oi register with one light beam, another aperture moves in register with the other light beam. The apertures I25 and the locations of the beams III and H5 is such that the apertures are out of phase, thus producing two carrier waves II I' and H55 (Figure 12), the result of which is to produce a direct current that is supplied to an amplifier circuit I25, amplifier I21, and wire I25, that is connected to the plate 5|. The plate 2I'- is connected to the ground 45 by means of a wire 45'. p

The amplifier I21 is a capacity resistance coupled amplifier of known construction, that includes a condenser that will not pass the aforesaid direct current. However, when the spot occurs under the beam .III, the beam is darkened and the resulting current from the photocell. I I4 III (Figure 12). The result of the two carrier waves is to produce or wave form III'.

a pulsating current that will pass the amplifier I 2i and be impressed across the cathode ray plates 3I, 3|. Thus, when the spot is in register, one of the waves (II5') as controlled by the other wave (III causes the cathode ray to 'be deflected.

In operation the spot size and the speedof the disc I23 and number of apertures I25 is preferably such that, while the spot I06 is in line with the light beam of the optical system II'I (hereinafter referred to as light beam III), at least two apertures will be successivelyaligned with the light beam III. This is illustrated in Figure 11 wherein the beam and spot are shown greatly enlarged and in proper time phase with frequency Thus, with imperfect synchronism of the apertures I 25-with the spot I06 there will always result a frequency and prevent no response that would occur if the spot were of such size that, during its alignment with the axis of the beam III, the disc I23 obstructed the beam by the failure of an aperture to appear while the spot was so positioned.

It will be observed that the greater the number of cycles occuring during the time of spot occurrence, the more accurate will be the indication. For example, in Figure 11, the half cycle III might be lost if the beam were obstructed by the disc during the occurrence of the corresponding portion of the spot under the beam path if the mechanism were inimperfect synchronism. However, by providing a greater multiple of cycles, this lack of sensitivity is correspondingly reduced.

It will be apparent, however, that if the synchronism of the disc I23 with the spot I06 is accurately controlled, only a single cycle is needed for each spot occurrence.

If, therefore, the time switch 44 is adjusted to a zero position in which the contact arm 53 en- 1y cause, false indications of the condition of register of the printed material on the web. In order that these mechanical variations in the printing operation may not produce false indications of the condition of register of the web, one of the printed impressions (that is, the spot printed at the time the impression is made) is used as a key color to block out indications provided by the cathode ray beam when the printing units are in the proper condition of register. For example, inasmuch as the black impression is generally used as the key impression in printing, I will describe this aspect of the invention in connection with the use of the black ages the mid-terminal SI, at the time of the impulse from the photoelectric 'cell III, by reason of the light beam II5 falling upon it, the cathode ray beam will be deflected at the mid-point of its travelbetween the plates 30 and 30', as illustrated in Figure 1. If the spot I06 is not in register, the photoelectric cell III will be energi'zed either in advance or following the point at which the beam reaches the central position in its travel between the plates 30 and 30' and the cathode ray beam would thus be deflected either before or after it reaches the central point, thus visually indicating the .lack of registration both in degree and time.

A further source of power forthe cathode ray J circuit is provided by the secondary winding I4 and tube 18 to center the path of the beam between plates 3| and 3I'. The plate of the tube is connected to the secondary by means of the wire 19 and the filament is energized by an auxiliary secondary I 4' and circuit 80, in the known fashion. A resistance 8| is connected across the secondary I4 and tube I8 by means of a wire 82 connected to the tubefllament and a wire 83 connected to the secondary ll. A resistance 84 is connected between the wires 82 and 83 and at its mid-point is grounded at 85. A condenser 86 is also connected across the wires 82 and 83. A

' variable contact 81 is connected by a wire" to a resistance 89 and the wire I28, and the wire 88 is grounded at 90 through a condenser SI. Mechanical variations in printing operations,

. such as, for example, backlash or hunting of the rolls or the use of difi'erent sizes of feed rolls and as'the key color. To accomplish the intended result, I utilize the impulse derived from the spot corresponding to the black color (hereinafter referred to as the black spot) to nullify the eflect produced upon the cathode ray beam by the other spots when the condition of proper registration is secured. To accomplish this, the control-electrode 21 is subjected to a negative voltage at the proper time by the black spot.

Referring again to Figure 1, wire 38 includes a resistance 92 across which wires 93 and 94 are connected. Wire 94 is connected to the primary of a transformer 05 and also to the mid-point of its secondary winding. The secondary winding of by the other spots on the web. It is understood,

of course, that the cell III is provided with the double beam and rotating disc structure previously described herein. The only modulation of the cathode ray beam, accordingly, occurs when the web is out of register with the cylinder corresponding to the photoelectric cell and cathode ray tube in question. When the web is out of register, then the occurrence of the negative voltage on the control electrode, as a result of the 'black spot, will not be in synchronism with the modulating curent from the photoelectric cell Ill and the cathode ray beam will be deflected acprinting cylinders sometimes cause, or apparentcordingly.

Figures 9 and 10 illustrate other means for utilizing one color as the key color to nullify the effect produced by the photoelectric cell when the device is in register. In Figure 9, for example, the plate 3| is shown as being formed of two plates 8la and 3|b.- The impulse received from the photocell sensitive to the black or other key color spot is applied to the plate Ila, whereas the wire I20 is connected to the plate lIb. In this structure, the impulse from the key color is utilized to deflect the cathode ray beam entirely oil of the screen when the impulse-occurs from circuit I28. In Figure 10 a further modification is shown in which the cathode ray tube is provided with a series of individual plates 3| and 3V, each'of which is grounded. Plates 3Ic and 3Id cooperate with the respective plates 3| and ll' in the following manner. The key color impulse is impressed upon plate lId by means of a wire I50, whereas the wire I28-is connected to the plate 3Ic. In.this assembly the beam from.

the key color, by means. of plates 3Id and t'l' neutralize the effect of the color beam supplied through the circuit including wire I28 and plates 3Ic and 3I'. In order to provide more effective control by the use of the key color, the number of impulses in the key color circuit is preferably twice or some other multiple of the impulses in the circuit I28 for the reason previously explained.

In order that the mechanism may be interlocked with the press control mechanism so that it will be disconnected when the press is not op-' erating, the main press control switch is provided with a link I29 that operates a switch I30 to close a circuit I3l including a battery I32 and a relay coil I33. The relay coil I33 closes a switch contact I34 against a spring I35 to close a circuit including a wire I36 connected to the wire 2I and a wire I31 connected to the negative end of resistance 35. When the press is not operating. the relay contact I34 is open and the resistance 35 is thus disconnected from the power circuit.

In Figures 1 and 8 there is shown a device by means otwhich control of the register of the web may be accomplised automatically. The printing machine, in accordance with common practice, is provided with a reversible electric motor I'5I which is utilized to actuate a web tensioning mechanism of suitable form. One such motor and web tensioning mechanism is provided, of course, for each printing, unit, and the details of this mechanism need not be described further herein. It'is sufiicient to state that the motor is controlled by two circuits includes mechanism operated by a cathode ray tube I54. Within the cathode ray tube are provided beam obstruction plate I55 and I56 spaced at I51 a distance representing the tolerance to be provided in the degree of register accomplished by the mechanism. As long as the cathode ray beam direction is such that the beam passes between the plates I55 and I56 and through the space I51, the operating mechanism will not function. Howevenif the register is oflPin either direction, the beam'will be deflected from the space I51 to strike the appropriate plate I55 or I56. Assuming that the beam strikes plate I56, the motor II will be operated to correct the offregistry by means of a circuit including a wire I56 connected to an amplifier shown schematically at I59. The amplifier is provided with a circuit I60 within which a relay coil I6I is connected, the relay coil'serving to move a movable relay contact I62 into contact with a stationary contact I63 and close the circuit I53 connected to the motor I5I. When the beam no longer strikes the obstruction plate I56, the relay coil I6I will be de-energized and the contact I62 opened, thus preventing further operation of the control mechanism. I

Wire I52 is provided with connections and devices similar to those with wire I53, being indicated generallyat I64.

I claim:

1. In a. device for indicating the movement of a drive means for presenting indicia periodically to a desired location, the combination of an electroresponsive device having a first means to maintain a normal electro-responsive operation and having a second means to vary said operation from normal,,means responsive to the occurrence of the indicia at the aforesaid location to supply an electric current to the second means, an electrical resistance, means to apply an electrical p0 tential to opposite ends of. the resistance, means to ground the mid-point of the resistance and the first means, a movable contact element for the resistance, means to connect the movable element electrically to the first means, and means to move the movable element in synchronism with the drive means.

2. In a device for indicating the movement of a drive means for presenting indicia periodically to a, desired loos-ton. the combination of an electro-responsive device leaving a first means to .maintain a normal electro-responsive operation and having a second means to which an electric current having a periodic frequency is applied to vary said operation from normal means responsive to the occurrence of the indicia at the aforesaid location to supply an electric current having a periodic frequency to the second means, an electrical resistance having a mid-contact, means to apply an electrical potential to opposite ends of the resistance, a movable contact element for the resistance, means to connect the movable element electrically to the first means,

' means to move the movable element in synchro- I52 and I53, each'of which described in connection beams alternately to cause nism with the drive means, the mid-contact of the resistance being sufilciently wide so that the movable contact element will be in contact therewith to maintain the electro-responsive operation for a time interval sufiicient to cause more than one cycle in the current to the second means.

3. In a devicefor indicating the movement of a drive means for presenting indicia periodically to a desired location, the combination of an electro-responsive device having a first means to maintain a normal electro-responsive operation and having a second means to vary said operation from normal, means responsive to the occurrence of the indicia at the aforesaid location to supply an electriccurrent to the second means, means to direct a light beam to the said desired location-and from the said location to the indicia responsive means; means to direct a second light beam to the indicia responsive means, a rotatable apertured disc positioned to intercept said light the indicia-responsive means to generate a pulsating electric current having a frequency, an electrical resistance, means to apply an electrical potential to opposite ends of the resistance, a movable contact element for the resistance, means to connect the movable element electrically to the first means, means to move the movable element insynchronism with the drive means, and a mid-contact in the resistance, the length of the mid-contact and the fre'- quency of the interruption of said light beams being such that more than one cycle is impressed upon the second means whilethe movable contact element is on the mid-contact.

4. In a device for indicating the movement of a drive means for presenting indicia periodically to a desired location, the combination of an electro-responsive device having a first means to maintain a normal electro-responsive operation and having a second means to vary said opera tion from normal, means responsive to the occurrence of the indicia at the aforesaid location to supply an electric current to the second means, an

electrical resistance, means to apply an electrical 1 potential to opposite ends of the resistance, a movable contact element for the resistance, means to connect the movable element electrical- 1y to the first means, means tomove the movable element in synchronism with the drive means,

and means to adjust the relative position of the and I electrical resistance with respect to the drive means.

5. In a device for indicating the movement of a drive means for'presenting indicia periodically to a desired location, the combination of an electroresponsive device having a first means to maintain a normal electro-responsive operation and having a second means to vary said operation from normal, means responsive to the occurrence of the indicia at the aforesaid location to supply an electric current to the second means, an electrical resistance having a mid-contact, means to apply an electrical potential to opposite ends of the resistance, a movable contact element for the resistance, means to connect the movable element electrically to the first means, means to move the movable element in synchronism with the drive means, and means to adjust the relative position of the mid-contact and the movable contact element.

6. In a device for indicating the movement of a drive means for presenting indiciaperiodically to a desired location, the combination of an electro-' responsive device having a first means to maintain. a normal electro-responsive operation and having a second means to vary said operation from normal, means responsive to the occurrence of the indicia at the aforesaid location to supply an electric current to the second means, an electrical resistance having a mid-contact, means to apply an electrical potential to opposite ends of the resistance, a movable contact element for the resistance, means to connect the movable element electrically to the first means, means to move the movable element in synchronism with the drive means, and means to adjust the posi-. tion of the mid-contact with respect to the drive means.

'7..In a device for indicating the movement 01- a drive means for presenting indicia periodically to a desired location, the combination of an elec-' tro-responsive device having a first means to maintain a normal electro-responsive operation and having a second means to vary said operation from normal, means responsive to the'occurrence of the indicia at the aforesaid location to supply an electric current to the second means, an electrical resistance having a mid-contact, means to apply an electrical potential to opposite ends of 'the resistance, a movable contact element for the resistance, means to connect the movable element electrically to, the first means, means to move the movable element in synchronism with the drive means, a rotatable disc upon which the resistance element is mounted, and means to adjust the position of the disc to vary the position of the mid-contact.

8. In a device for indicating the movement of a. drive means for presenting key and main indicia periodically to separate respective desired locations, the combination .of an electro-responsive device having a first means to maintain'a normal electro-responsive operation and having a second means to vary said operation from normal, means responsive ot the occurrence of the main indicia at its respective desired location to supply an electric current to the second means, and means responsive .to the occurrence of the main indicia at its respective desired location to supplyan;

electric current to the second means opposite in eil'ect to the current supplied in response to the main indicia.

9. In a device for indicating the movement ofa drive meansfor presenting key and main indicia periodically to separate respective desired aevaavo electric current to the second means having a greater frequency than the current supplied in response to the main indicia and being opposite in eflfeot thereto.

10. In a device for indicating the movement of a drive means for presenting key and main indicia periodically to separate respective desired locations, the combination of a cathode ray tube having a first pair of electrodes and means to direct a cathode ray beam periodically in a normal path back and forth between said first electrodes and a second pair of electrodes adapted to deflect the beam from its normal path, means responsive to the occurrence of the main indicia at its respective desired location to supply an electric current to the.second pair of electrodes to deflect locations, the combination .of a cathode ray tube having a first pair of electrodes and means to direct a cathode ray beam periodically in a normal path back and forth between said first electrodes and a second pair of electrodes adapted to deflect the beam from its normal path, means responsive to the occurrence of the main indicia at its respective desired location to supply a periodically pulsating electric current to the second pair of electrodes to deflect the beam from its normal path, and means responsive to the occurrence of the key indicia at its respective desired location to supply a periodically pulsating electric current to the cathode ray tube having a greater frequency than the current supplied in response to the main indicia to counteract the efiect thereof:

12. In a device for controlling the operation of mechanism for presenting an indicia to a desired 7 location periodically including electrical mechanism for varying the time of. occurrence of the indicia at the aforesaid location, the combination of means responsive to the occurrence'of the indicia at the aforesaid location to generatean electric current, a cathode ray tube, means to apply the current to the tube to deflect the cathode ray beam'thereof, a beam obstruction surface in the tube, an amplifier circuit connected to the beam obstruction surface, a relay having contacts connected to the amplifier circuit, and a circuit including the relay contacts and the said electrical mechanism whereby'improper indicia occurrence at the aforesaid location is corrected by impingement of the cathode ray beam upon the obstruction surface.

13. In a device for controlling the operation of mechanism for presenting an indicia to a desired location periodically having electrical mechanism for varying the time of occurrence of the indicia at the aforesaid location, the combination of means responsive to the occurrence of the indicia from the source to the electrical impulses, an

at the aforesaid location to generate an electric current, a cathode ray tube, means to apply the current to the tube to deflect the cathode ray beam thereof, a beam obstruction surface in the tube, a relay having contacts connected to the beam obstruction surface, and a circuit including the relay contacts and the said electrical mechanism whereby improper indicia occurrence at the aforesaid location is corrected by impingement of the cathode ray beam upon the obstruction surface.

.14. In a device for controlling the operation of mechanism for presenting an indicia to a desired location periodically having electrical mechanism for varying the time of occurrence of the indicia at the aforesaid location, the combination of means responsive to the occurrence of the indicia at the aforesaid location to generate an electric current, a cathode ray tube, means to apply the current to cathode ray beam thereof, spaced beam obstruction surfaces in the tube positioned so that nor- .mal deflection of the cathode ray beam occurs in the space between the surfaces, an amplifier circuit connected to each of the beam obstruction surfaces, a relay having contacts connected to each amplifier circuit, and circuits including the respective relay contacts and the said electrical mechansm, whereby improper indicia occurrence at the aforesaid location ment of the cathode ray beam upon tion surfaces.

15. Web register mechanism for controlling the obstrucmeans to supply to a predetermined location preof a web bearing indicia first means responsive to indicia responsive means, direct a beam of light predetermined location to be reflected from said predeterconditioned portions thereon, comprising 9. electrical impulses, an a light source, means to upon theweb, mined location in the absence of an indicium at said location, means to direct a second light beam to the indicia responsivemeans, means for alternately interrupting said light beams in timed relation to a predetermined desired occurrence at said location of said indicia and means to supply electrical impulses from the indicia responsive means to the said first means to actuate the said first means in timed relation to the occurrence of indici: at the predetermined location.

conditioned portions of a web bearing indicia thereon, comprising a first means responsive to indicia responsive means, a light source, means to direct a beam of light from the source to the predetermined location upon the web, to be reflected from said predetermined location to the indicia responsive means, in the absence of an indicium at'said location, means to direct a second light beam to the indicia responsive means, means to interrupt said light beams periodically and alternately in timed relation to said means to supply portions of said web, and means to supply electrical impulses from the indicia responsive means to the first means to actuate timed relation to the occurrence of preconditioned portions of the web at the predetermined location. I

1'1. Web register mechanism for controlling means to supply to a predetermined location preconditioned portions of +a web bearing indicia thereon, comprising a first means responsive to electrical impulses, an indicia responsive means,

the tube to deflect the is corrected by impinge- I to the indicia responsive means,

the said firs't means in Web register mechanism for controlling cation means to means to supply to a predetermined location pre- I electrical impulses, an

a light source, means to direct a beam of light from the source to the predetermined location upon the web, to be reflected from said predetermined location to the indicia responsive means, in the absence of an indicium at said location, means to direct a second light beam to the indicia responsive means, means to interrupt said light beams periodically and alternately with a periodicity of the desired occurrence of the preconditioned portions of the web at the predetermined location, and means to supply electrical impulses from the indicia responsive means to the said first means to actuate the said first means in timed relation to the occurrence of preconditioned portions of the web at the predetermined location.

18. Web register mechanism for controlling means to supply to a predetermined location preconditioned portions of a web bearing indicia thereon, comprising a first means responsive to electrical impulses, an indicia responsive means, a light source, means to direct a beam of light from the source to the predetermined location upon the web to be reflected from said predetermined location to the indicia responsive means, in the absence of an indicium at said location, means to direct a second light beam to the in-. dicia responsive means, a disc mounted in the path of said light beams, apertures in the disc formed to obstruct one light beam when the other is unobstructed, means for rotating said disc to cause the first mentioned light beam to be directed onto said web in timed relation to a predetermined desired ocurrence of indicia at said location and means to supply electrical imlocation.

19. Web register mechanism for controlling means to supply to a predetermined location preconditioned portions of a web bearing indicia thereon, comprising a first means responsive to a light source, means to direct a beam of light from the source to the predetermined location upon the web, to be reflected from said predetermined location to the indicia responsive means, in the absence of an indicium at said 10- direct a second the indicia responsive means, a disc mounted in the path of said light beams, apertures in the disc formed to obstruct one light beam when the other is unobstructed, means to rotate the disc at a speed such that an aperture in the disc will be in register with the first light beam at the time the preconditioned portions of the web are in register therewith when the periodicity of occurrence of thepreconditioned portions of the web at such point is as desired, and means to supply electrical impulses from the indicia responsive means to the first means to actuate the first means in timed relation to the occurrence of indicia responsive means, f

light beam to in the absence. of an indicium at said location,

means to direct a second light beam to the indicia responsive means, a disc mounted in the path oi said light beams, apertures in the disc formed to obstruct one light beam when the other is unobstructed. means to rotate the disc at a speed such that an aperture in the disc will be in register with the first light beam at the time the indicia on the web are in register therewith when theperiodicity of occurrence of the indicia on the web at such point is as desired, and

a condenser.

HERMANN KOTT. 

